Pressure self-sealing stop valve with closing unloading

Abstract

The application provides a pressure self-sealing stop valve with closing in sequence and unloading, and relates to the field of petroleum pipeline valves.The valve body is provided with an inlet on the right side and an outlet on the left side, and a valve cover is installed on the upper end of the valve body.A sealing shaft sleeve is arranged in the middle of the upper end surface of the valve cover, and a support plate is fixedly installed on the outer part of the upper end surface of the valve cover.The stop valve adopts the closing in sequence mode, and when the petroleum pressure in the inlet is higher, the downward pressure on the circular valve disc and the sealing block will be greater, the downward pressure on the circular valve disc and the sealing block will be greater, and the sealing effect will be better, so that the stop effect of the stop valve is effectively improved.The problem that the existing stop valve for petroleum pipelines generally adopts the reverse closing mode, so that the sealing performance is poor when the pressure is high, and the stop effect of the stop valve is affected is solved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum pipeline valves, in particular to a pressure self-sealing stop valve with forward closing and unloading. Background Art

[0002] With the rapid development of the oil industry, oil pipelines, as the main mode of oil transportation, are increasingly valued for their safety and reliability. In the process of oil pipeline transportation, stop valves, as an important control device, can effectively control the flow of oil and ensure the safe operation of oil pipelines.

[0003] However, the stop valves used in existing oil pipelines generally adopt a reverse closing design. Such a design cannot achieve pressure self-sealing, so when the pressure is high, the sealing performance will be poor, affecting the stop effect of the stop valve, resulting in the stop valve being unable to close completely or not closing tightly, thereby causing fluid leakage. The leakage of fluid not only wastes energy, but also may pollute the environment. Especially when handling harmful or flammable media, leakage may cause safety accidents, thereby reducing the reliability of the stop valve during use. In addition, the stop valve of the reverse closing method will be affected by the fluid pressure during the closing process, making the stop valve of the reverse closing method more laborious during the closing operation. Summary of the Invention

[0004] The disclosed embodiment relates to a pressure self-sealing stop valve with smooth closing and unloading, which can automatically achieve sealing of the circular groove and the tapered through-hole through the arrangement of a push spring, a sliding cylinder, a strip slider and a strip slide groove, and the stop valve adopts a smooth closing method. When the oil pressure inside the inlet port is higher, the downward pressure on the circular valve flap and the sealing block will be greater, and the downward pressure on the circular valve flap and the sealing block will be greater, and the sealing effect will be better, thereby effectively improving the stop effect of the stop valve and avoiding the phenomenon that the stop valve cannot be completely closed or is not closed tightly; through the downward elastic force of the push spring and the pressure of the oil inside the inlet port, the circular valve flap and the sealing block are more labor-saving when performing the downward closing operation, and can achieve a self-sealing effect.

[0005] The first aspect of the present disclosure provides a pressure self-sealing stop valve with a normally closed unloading function, which specifically comprises a valve body, a flow inlet is arranged on the right side of the valve body, a flow outlet is arranged on the left side of the valve body, and a valve cover is installed on the upper end of the valve body; a sealing shaft sleeve is arranged on the middle part of the upper end surface of the valve cover, a support plate is fixedly installed on the outer part of the upper end surface of the valve cover, a valve rod is rotatably connected to the inner part of the sealing shaft sleeve, a spiral stripe is arranged on the lower side of the outer circumferential surface of the valve rod, a sliding cylinder is connected to the outer lower end of the valve rod through the spiral stripe, a circular valve disc is fixedly connected to the lower end of the sliding cylinder, a push spring is sleeved on the outer part of the valve rod between the sliding cylinder and the valve cover; a driving mechanism is installed on the upper end surface of the support plate, two T-shaped sliding grooves are arranged on the right side of the upper end surface of the support plate, a N-shaped sliding frame is slidably connected to the two T-shaped sliding grooves, an automatic push mechanism is fixedly installed on the upper end surface of the N-shaped sliding frame, and a one-way limiting mechanism is arranged on the left end of the automatic push mechanism; and a plug-in part is installed on the bottom end surface of the inner side of the N-shaped sliding frame.

[0006] In at least some embodiments, the right side of the upper end surface of the support plate is provided with a plug-in hole; the bottom end surface of the N-shaped sliding frame is provided with two T-shaped sliding blocks, and the two T-shaped sliding blocks are slidably connected to the two T-shaped sliding grooves, respectively.

[0007] In at least some embodiments, the inner part of the valve body is provided with a stop block, a circular recess is arranged on the middle part of the upper end surface of the stop block, a tapered through hole is arranged on the inner bottom end surface of the circular recess, the diameter of the inner circumferential surface of the circular recess is equal to the diameter of the outer circumferential surface of the circular valve disc, a circular through hole is arranged on the middle part of the bottom end surface of the stop block and communicates with the tapered through hole, and four strip-shaped sliding grooves are arranged on the upper inner circumferential surface of the valve body in an annular array.

[0008] In at least some embodiments, a rotating hand wheel is arranged on the upper end of the valve rod, a one-way wheel is fixedly installed on the outer upper end of the valve rod, and fan-shaped tooth blocks are arranged on the outer circumferential surface of the one-way wheel in an annular array.

[0009] In at least some embodiments, four strip-shaped sliding blocks are arranged on the outer circumferential surface of the sliding cylinder in an annular array, and the four strip-shaped sliding blocks are slidably connected to the four strip-shaped sliding grooves, respectively; a spiral groove is arranged on the inner circumferential surface of the sliding cylinder and is connected to the spiral stripe; and the elastic force of the push spring is greater than the frictional force between the spiral groove and the spiral stripe.

[0010] In at least some embodiments, a sealing block is arranged on the bottom of the circular valve disc, and the lower outer circumferential surface of the sealing block is a tapered surface.

[0011] In at least some embodiments, the driving mechanism comprises a driving motor, a passive gear and a driving gear, the driving motor is fixedly installed on the left rear side of the upper end surface of the support plate, a driving gear is fixedly installed on the rotating shaft of the driving motor, the passive gear is fixedly installed on the upper end of the outer part of the valve rod, the passive gear is engaged with the driving gear, and the diameter of the passive gear is three to four times the diameter of the driving gear.

[0012] In at least some embodiments, the automatic pushing mechanism comprises an electric cylinder, a pushing plate, a transverse guide rod and a sliding sleeve, the electric cylinder is fixedly installed on the top of the H-shaped sliding frame, the left end of the telescopic rod of the electric cylinder is fixedly connected with the pushing plate, the right end surface of the pushing plate is fixedly connected with a transverse guide rod on the front and rear sides, each transverse guide rod is externally slidably connected with a sliding sleeve, and the sliding sleeve is fixedly connected to the outside of the electric cylinder.

[0013] In at least some embodiments, the one-way limiting mechanism comprises a rectangular sliding cylinder, a rectangular sliding column, a tightening block, a triangular one-way limiting block and a limiting block, the rectangular sliding cylinder is fixedly installed on the left end surface of the middle part of the pushing plate, the rectangular sliding cylinder is slidably connected with the rectangular sliding column inside, the left end of the rectangular sliding column is fixedly connected with the tightening block, and the left end surface of the tightening block is provided with a triangular one-way limiting block; four rectangular through holes are formed in the outside of the rectangular sliding cylinder, four limiting blocks are fixedly connected to the rectangular sliding column, and the four limiting blocks are respectively located in the four rectangular through holes formed in the rectangular sliding cylinder; when the one-way limiting mechanism is in the one-way limiting state, the triangular one-way limiting block is in close contact with the right side of the outer peripheral surface of the one-way wheel.

[0014] In at least some embodiments, the insertion part comprises a rectangular shell, a rectangular sliding block, an insertion rod and a handle, the rectangular shell is fixedly installed on the inside bottom end surface of the H-shaped sliding frame, the rectangular shell is slidably connected with the rectangular sliding block inside, the insertion rod penetrating through the lower part of the rectangular shell is fixedly connected to the bottom end surface of the rectangular sliding block, a spring is arranged inside the rectangular shell on the upper side of the rectangular sliding block, and the handle is fixedly connected to the right end surface of the rectangular sliding block; when the insertion part is in the limiting state, the insertion rod is inserted into the insertion hole.

[0015] The application provides a pressure self-sealing stop valve with the following beneficial effects:

[0016] I. When it is necessary to cut off the oil, the extension rod of the electric cylinder is retracted to the right, the one-way limiting mechanism is moved to the right as a whole, the triangular one-way limiting block is separated from the right side of the outer periphery of the one-way wheel, the sliding cylinder starts to move linearly downward under the elastic force of the push spring, the circular valve disc and the sealing block are moved downward, the circular groove and the tapered through hole are automatically sealed, the higher the oil pressure in the inlet is, the greater the downward pressure on the circular valve disc and the sealing block is, the better the sealing effect is, the cutting-off effect of the cut-off valve is improved, the cut-off valve cannot be completely closed or closed tightly, fluid leakage is avoided, energy waste, environmental pollution and safety accidents are avoided, and the reliability of the cut-off valve is improved.

[0017] II. The unloading effect is realized when the cut-off valve is closed, the circular valve disc and the sealing block are more labor-saving when they are closed downward, the self-sealing effect is realized, the structure is simple, the cost is low, and the practicality is high.

[0018] III. The one-way limiting mechanism is arranged, the one-way limiting mechanism can be used to limit the counterclockwise rotation of the one-way wheel and the valve rod, the opened circular valve disc and the sealing block cannot be automatically closed, and the reliability of the cut-off valve is improved.

[0019] IV. When it is necessary to manually close the cut-off valve, the handle is pulled upward, the rectangular sliding block and the insertion rod are moved upward, the insertion rod is pulled out of the insertion hole, the H-shaped sliding frame is no longer limited on the upper part of the supporting plate, the H-shaped sliding frame is slid to the right, the one-way limiting mechanism is moved to the right as a whole, the triangular one-way limiting block is separated from the right side of the outer periphery of the one-way wheel, the sliding cylinder starts to move linearly downward under the elastic force of the push spring, the circular valve disc and the sealing block are moved downward, the circular groove and the tapered through hole are automatically sealed, the cut-off valve can be manually and electrically opened and closed, and the flexibility of the cut-off valve is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below.

[0021] The drawings in the following description only relate to some embodiments of the present application, and are not limited to the present application.

[0022] In the drawings:

[0023] Figure 1 A structural schematic diagram of the first perspective of the present application is shown;

[0024] Figure 2 A structural schematic diagram of the second perspective of the present application is shown;

[0025] Figure 3 A structural schematic diagram of the valve body, the inlet, the outlet, the valve cover, the sealing sleeve, the support plate and the stop block of the present application is shown in partial section;

[0026] Figure 4 A structural schematic diagram of the valve body, the inlet, the outlet and the stop block of the present application is shown in partial section;

[0027] Figure 5 A structural schematic diagram of the valve disc and the sealing block of the present application is shown in open state;

[0028] Figure 6 A structural schematic diagram of the valve disc and the sealing block of the present application is shown in closed state;

[0029] Figure 7 A structural schematic diagram of the valve rod and the sliding cylinder of the present application is shown in disassembled state;

[0030] Figure 8 A structural schematic diagram of the valve rod, the one-way wheel and the one-way limiting mechanism of the present application is shown;

[0031] Figure 9 A structural schematic diagram of the one-way wheel and the one-way limiting mechanism of the present application is shown;

[0032] Figure 10 A structural schematic diagram of the plug-in part of the present application is shown;

[0033] Figure 11 A structural schematic diagram of the support plate, the T-shaped sliding groove and the plug-in hole of the present application is shown.

[0034] List of reference signs

[0035] 1. Valve body; 101. Inlet; 102. Outlet; 103. Valve cover; 104. Sealing sleeve; 105. Support plate; 106. T-shaped sliding groove; 107. Plug-in hole; 108. Bar-shaped sliding groove; 109. Stop block; 1010. Circular recess; 1011. Conical through hole; 1012. H-shaped sliding frame;

[0036] 2. Valve rod; 201. Rotating hand wheel; 202. One-way wheel; 203. Sliding cylinder; 204. Bar-shaped sliding block; 205. Circular valve disc; 206. Sealing block; 207. Pushing spring; 208. Spiral stripe; 209. Spiral groove;

[0037] 3, drive mechanism; 301, drive motor; 302, driven gear; 303, driving gear;

[0038] 4, automatic push mechanism; 401, electric cylinder; 402, push plate; 403, transverse guide rod; 404, sliding sleeve;

[0039] 5, one-way limiting mechanism; 501, rectangular slide cylinder; 502, rectangular slide column; 503, clamping block; 504, triangular one-way limiting block; 505, limiting block;

[0040] 6, plug-in part; 601, rectangular shell; 602, rectangular slide block; 603, plug-in rod; 604, handle. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0042] Embodiment one: please refer to Figures 1 to 11 :

[0043] The present application provides a pressure self-sealing stop valve with closing and unloading, comprising: a valve body 1, a flow inlet 101 is arranged on the right side of the valve body 1, and a flow outlet 102 is arranged on the left side of the valve body 1, and a valve cover 103 is installed on the upper end of the valve body 1; a sealing shaft sleeve 104 is arranged in the middle of the upper end surface of the valve cover 103, and a support plate 105 is fixedly installed on the outer part of the upper end surface of the valve cover 103, a valve rod 2 is rotatably connected inside the sealing shaft sleeve 104, a spiral stripe 208 is arranged on the lower side of the outer circumferential surface of the valve rod 2, a sliding cylinder 203 is connected to the outer lower end of the valve rod 2 through the spiral stripe 208, a circular valve disc 205 is fixedly connected to the lower end of the sliding cylinder 203, and a push spring 207 is sleeved on the outer part of the valve rod 2 between the sliding cylinder 203 and the valve cover 103; a drive mechanism 3 is installed on the upper end surface of the support plate 105, two T-shaped sliding grooves 106 are formed on the right side of the upper end surface of the support plate 105, and a H-shaped sliding frame 1012 is slidably connected on the two T-shaped sliding grooves 106, an automatic push mechanism 4 is fixedly installed on the upper end surface of the H-shaped sliding frame 1012, and a one-way limiting mechanism 5 is arranged on the left end of the automatic push mechanism 4; a plug-in part 6 is installed on the inner bottom end surface of the H-shaped sliding frame 1012, which is used for limiting the H-shaped sliding frame 1012.

[0044] The right side of the upper end face of the support plate 105 is provided with a plug hole 107; the bottom end face of the Z-shaped sliding frame 1012 is provided with two T-shaped sliding blocks, and the two T-shaped sliding blocks are respectively connected with two T-shaped sliding grooves 106 in a sliding manner, so that the Z-shaped sliding frame 1012 can only slide linearly in the left-right direction on the support plate 105.

[0045] The valve body 1 is internally provided with a stop block 109, and a circular groove 1010 is formed in the upper end face of the stop block 109, and a conical through hole 1011 is formed in the inner bottom end face of the circular groove 1010, the inner circumferential surface of the circular groove 1010 has a diameter equal to that of the outer circumferential surface of the circular valve disc 205, and a circular through hole is formed in the middle of the bottom end face of the stop block 109 and communicates with the conical through hole 1011; four strip-shaped sliding grooves 108 are formed in the upper inner circumferential surface of the valve body 1 in an annular array, and are connected with the strip-shaped sliding blocks 204 in a sliding manner.

[0046] The upper end of the valve rod 2 is provided with a rotating handle 201, and a one-way wheel 202 is fixedly installed on the outer upper end of the valve rod 2, and the outer circumferential surface of the one-way wheel 202 is provided with a plurality of sector-shaped tooth blocks in an annular array, which realizes the one-way limiting effect of the valve rod 2, specifically the limiting effect of counterclockwise rotation.

[0047] The outer circumferential surface of the sliding cylinder 203 is provided with four strip-shaped sliding blocks 204 in an annular array, and the four strip-shaped sliding blocks 204 are respectively connected with the four strip-shaped sliding grooves 108 in a sliding manner; a spiral groove 209 is formed in the inner circumferential surface of the sliding cylinder 203, and the spiral groove 209 is connected with the spiral stripe 208; the elastic force of the push spring 207 is greater than the friction force between the spiral groove 209 and the spiral stripe 208, so that when the triangular one-way limiting block 504 is separated from the right side of the outer circumferential surface of the one-way wheel 202, the sliding cylinder 203 can move linearly downward under the elastic force of the push spring 207, and the circular valve disc 205 and the sealing block 206 are moved downward, thereby automatically sealing the circular groove 1010 and the conical through hole 1011.

[0048] The bottom of the circular valve disc 205 is provided with a sealing block 206, and the lower outer circumferential surface of the sealing block 206 is a conical surface, which can be more closely contacted with the conical through hole 1011, thereby improving the sealing performance of the sealing block 206 in the closed state.

[0049] The driving mechanism 3 comprises a driving motor 301, a passive gear 302 and a driving gear 303, the driving motor 301 is fixedly installed on the left side of the upper end face of the support plate 105, a driving gear 303 is fixedly installed on the rotating shaft of the driving motor 301, the passive gear 302 is fixedly installed on the upper end of the outer part of the valve rod 2, the passive gear 302 is engaged with the driving gear 303, the diameter of the passive gear 302 is three to four times of the diameter of the driving gear 303, so that the driving gear 303 is more labor-saving when rotating with the passive gear 302, and a smaller driving motor 301 can be used to drive the valve rod 2.

[0050] The automatic pushing mechanism 4 comprises an electric cylinder 401, a pushing plate 402, a transverse guide rod 403 and a sliding sleeve 404, the electric cylinder 401 is fixedly installed on the top of the Z-shaped sliding frame 1012, the left end of the telescopic rod of the electric cylinder 401 is fixedly connected with the pushing plate 402, the right end face of the pushing plate 402 is fixedly connected with a transverse guide rod 403 on the front and back sides, each transverse guide rod 403 is externally and slidably connected with a sliding sleeve 404, and the sliding sleeve 404 is fixedly connected to the outside of the electric cylinder 401; through the setting of the automatic pushing mechanism 4, the unidirectional limiting mechanism 5 can be automatically moved left and right.

[0051] The unidirectional limiting mechanism 5 comprises a rectangular sliding cylinder 501, a rectangular sliding column 502, a tightening block 503, a triangular unidirectional limiting block 504 and a limiting block 505, the rectangular sliding cylinder 501 is fixedly installed on the left end face of the middle part of the pushing plate 402, the rectangular sliding column 502 is slidably connected in the rectangular sliding cylinder 501, the left end of the rectangular sliding column 502 is fixedly connected with the tightening block 503, and the left end face of the tightening block 503 is provided with the triangular unidirectional limiting block 504; four rectangular through openings are formed in the outer part of the rectangular sliding cylinder 501, four limiting blocks 505 are fixedly connected on the rectangular sliding column 502, and the four limiting blocks 505 are respectively located in the four rectangular through openings formed in the rectangular sliding cylinder 501; when the unidirectional limiting mechanism 5 is in the unidirectional limiting state, the triangular unidirectional limiting block 504 is in close contact with the right side of the outer circumferential surface of the unidirectional wheel 202; through the setting of the unidirectional limiting mechanism 5, the unidirectional limiting effect of the unidirectional wheel 202 and the valve rod 2 in the counterclockwise direction can be realized through the unidirectional limiting mechanism 5, so that the automatic closing of the opened circular valve disc 205 and the sealing block 206 can be effectively avoided.

[0052] In the embodiment two, on the basis of the embodiment one, Figure 1 and Figure 10As shown, the plug-in part 6 includes a rectangular shell 601, a rectangular slider 602, a plug-in rod 603 and a handle 604, the rectangular shell 601 is fixedly installed at the bottom end face inside the Z-shaped sliding frame 1012, and the rectangular slider 602 is slidably connected inside the rectangular shell 601, the bottom end face of the rectangular slider 602 is fixedly connected with the plug-in rod 603 penetrating through the lower part of the rectangular shell 601, a spring is arranged inside the rectangular shell 601 above the rectangular slider 602, and the right end face of the rectangular slider 602 is fixedly connected with the handle 604; when the plug-in part 6 is in the limiting state, the plug-in rod 603 is plugged with the plug-in hole 107; through the cooperation of the Z-shaped sliding frame 1012, the plug-in part 6 and the plug-in hole 107, when it is needed to manually close the stop valve, the handle 604 is only pulled upward by hand, the rectangular slider 602 and the plug-in rod 603 are moved upward, the plug-in rod 603 is pulled out from the inside of the plug-in hole 107, at this time the Z-shaped sliding frame 1012 loses the limiting effect on the upper part of the supporting plate 105, then the Z-shaped sliding frame 1012 is slid to the right, the one-way limiting mechanism 5 is moved to the right as a whole, the triangular one-way limiting block 504 is separated from the right side of the outer periphery of the one-way wheel 202, at this time the sliding cylinder 203 also starts to move linearly downward under the elastic force of the push spring 207, the circular valve disc 205 and the sealing block 206 are moved downward, and finally the circular recess 1010 and the conical through hole 1011 are sealed.

[0053] The working principle of the embodiment is as follows: in use, the inlet 101 and the outlet 102 in the stop valve are connected with the petroleum pipeline, then the petroleum in the petroleum pipeline enters into the inside of the valve body 1 through the inlet 101, when the circular valve disc 205 and the sealing block 206 are in the open state, the petroleum flowing into the inside of the valve body 1 flows to the inside of the outlet 102 through the circular recess 1010, the conical through hole 1011 and the circular through hole formed in the bottom end face of the stop block 109, and then flows out through the outlet 102;

[0054] When it is needed to stop the petroleum, the telescopic rod of the electric cylinder 401 is retracted to the right, the one-way limiting mechanism 5 is moved to the right as a whole, the triangular one-way limiting block 504 is separated from the right side of the outer periphery of the one-way wheel 202, at this time the one-way wheel 202 and the valve rod 2 lose the one-way limiting effect of counterclockwise rotation (as viewed from top to bottom, as shown in Figure 8 and Figure 9As shown in the figure, because the elastic force of the push spring 207 is greater than the friction force between the spiral groove 209 and the spiral stripe 208, the sliding cylinder 203 starts to move downward linearly under the elastic force of the push spring 207 at this time, thereby moving the circular valve disc 205 and the sealing block 206 downward, so that the lower conical surface of the sealing block 206 is in close contact with the inner circumferential surface of the conical through hole 1011, and at this time, the circular valve disc 205 enters the inside of the circular groove 1010 to automatically seal the circular groove 1010 and the conical through hole 1011. Because the present stop valve adopts the closing mode, when the oil pressure in the inlet port 101 is higher, the downward pressure on the circular valve disc 205 and the sealing block 206 will be greater, and the greater the downward pressure on the circular valve disc 205 and the sealing block 206, the better the sealing effect will be, thereby effectively improving the stopping effect of the present stop valve.

[0055] Through the downward elastic force of the push spring 207 and the pressure of the oil in the inlet port 101, the circular valve disc 205 and the sealing block 206 can be closed downward more easily and can realize self-sealing.

[0056] When it is necessary to open the circular valve disc 205 and the sealing block 206, the extension rod of the electric cylinder 401 is controlled to move leftward, so that the one-way limiting mechanism 5 moves leftward as a whole, the triangular one-way limiting block 504 is in close contact with the right side of the outer circumferential surface of the one-way wheel 202, then the driving motor 301 is started, and the rotating shaft of the driving motor 301 is controlled to rotate counterclockwise, thereby rotating the driven gear 302, the valve rod 2 and the one-way wheel 202 clockwise, at this time, the sector tooth block arc surface of the outer circumferential surface of the one-way wheel 202 will slide off the inclined surface of the triangular one-way limiting block 504 easily, so that the one-way limiting of the one-way wheel 202 and the valve rod 2 in the clockwise direction is not limited, and in the process of rotating clockwise, the spiral stripe 208 rotates clockwise, at this time, the sliding cylinder 203 moves upward linearly with the circular valve disc 205 and the sealing block 206 under the cooperation of the spiral stripe 208 and the spiral groove 209, thereby opening the circular valve disc 205 and the sealing block 206, and after being opened, the one-way limiting mechanism 5 can be used to limit the one-way wheel 202 and the valve rod 2 in the counterclockwise direction, thereby effectively avoiding the opened circular valve disc 205 and the sealing block 206 from being closed automatically, and improving the reliability of the present stop valve in use.

[0057] In this paper, the following points need to be noted:

[0058] 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can be referred to the general design.

[0059] 2. Embodiments of the present disclosure and features in embodiments can be combined with each other to obtain new embodiments in the case of no conflict.

[0060] The above merely describes specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A pressure self-sealing stop valve with a normally closed unloading, comprising: The utility model provides a valve body (1), the valve body (1) right side is provided with the flow inlet (101), and the valve body (1) left side is provided with the flow outlet (102), and the valve body (1) upper end is installed with the valve cover (103), its characterized in that, the valve cover (103) upper end surface middle part is provided with the sealing shaft sleeve (104), and the valve cover (103) upper end surface is located the sealing shaft sleeve (104) outside fixed installation has the support plate (105), the sealing shaft sleeve (104) inside rotation is connected with the valve stem (2), and the valve stem (2) outer circumferential surface downside is provided with spiral stripe (208), and the valve stem (2) outside lower end is connected with the sliding cylinder (203) through spiral stripe (208), and the sliding cylinder (203) lower end fixedly connected with the circular valve clack (205), the valve stem (2) outside between sliding cylinder (203) and valve cover (103) is sleeved with the push spring (207), the support plate (105) upper end surface is installed with the drive mechanism (3), and the support plate (105) upper end surface right side is provided with two T type sliding grooves (106), and two T type sliding grooves (106) are slidably connected with the N-shaped sliding frame (1012), and the N-shaped sliding frame (1012) upper end surface is fixedly installed with the automatic push mechanism (4), and the automatic push mechanism (4) left end is provided with the one-way limiting mechanism (5), the N-shaped sliding frame (1012) inboard bottom end surface is installed with the plug-in part (6), The valve body (1) upper inner circumferential surface is provided with four strip-shaped sliding grooves (108) in annular array; The valve stem (2) upper end is provided with a rotating hand wheel (201), and the valve stem (2) is fixedly installed with a one-way wheel (202) outside the upper end, and the one-way wheel (202) is provided with a plurality of sector teeth blocks in annular array on the outer circumferential surface; The sliding cylinder (203) is provided with four strip-shaped sliding blocks (204) in annular array on the outer circumferential surface, and the four strip-shaped sliding blocks (204) are slidably connected with the four strip-shaped sliding grooves (108) respectively; The sliding cylinder (203) inner circumferential surface is provided with a spiral groove (209), and the spiral groove (209) is connected with the spiral stripe (208); The elastic force of the push spring (207) is greater than the friction force between the spiral groove (209) and the spiral stripe (208); The automatic push mechanism (4) comprises an electric cylinder (401), a push plate (402), a transverse guide rod (403) and a sliding sleeve (404), the electric cylinder (401) is fixedly installed on the top of the N-shaped sliding frame (1012), and the telescopic rod left end of the electric cylinder (401) is fixedly connected with the push plate (402), the push plate (402) right end surface front and back sides are both fixedly connected with a transverse guide rod (403), and each transverse guide rod (403) is slidably connected with a sliding sleeve (404) outside, and the sliding sleeve (404) is fixedly connected to the outside of the electric cylinder (401). The one-way limiting mechanism (5) comprises a rectangular slide (501), a rectangular slide column (502), a tightening block (503), a triangular one-way limiting block (504) and a limiting block (505), wherein the rectangular slide (501) is fixedly mounted on the middle portion of the left end face of the push plate (402), and the rectangular slide column (502) is slidably connected inside the rectangular slide (501), and the left end of the rectangular slide column (502) is fixedly connected to the tightening block (503), and the left end of the tightening block (503) is fixedly connected to the left end of the tightening block (503). A triangular one-way limit block (504) is provided on the surface; four rectangular openings are opened on the outside of the rectangular slide (501); four limit blocks (505) are fixedly connected to the rectangular slide (502), and the four limit blocks (505) are respectively located in the four rectangular openings opened on the rectangular slide (501); when the one-way limit mechanism (5) is in the one-way limit state, the triangular one-way limit block (504) is in close contact with the right side of the outer peripheral surface of the one-way wheel (202).

2. A pressure self-sealing stop valve with a latching unloading according to claim 1, characterized in that: The right side of the upper end surface of the support plate (105) is provided with a plug hole (107); the bottom end surface of the U-shaped sliding frame (1012) is provided with two T-shaped sliding blocks, and the two T-shaped sliding blocks are respectively slidably connected to the two T-shaped sliding grooves (106).

3. The pressure self-sealing stop valve with forward closing and unloading function according to claim 1 is characterized in that: A cutoff block (109) is provided inside the valve body (1), and a circular groove (1010) is provided in the middle of the upper end surface of the cutoff block (109), and a tapered through hole (1011) is provided in the bottom end surface of the circular groove (1010), the inner circumferential surface diameter of the circular groove (1010) is equal to the outer circumferential surface diameter of the circular valve disc (205), and a circular through hole communicating with the tapered through hole (1011) is provided in the middle of the bottom end surface of the cutoff block (109).

4. A pressure self-sealing stop valve with a latching unloading according to claim 1, characterized in that: A sealing block (206) is provided at the bottom of the circular valve disc (205), and the lower outer peripheral surface of the sealing block (206) is a conical surface.

5. A pressure self-sealing stop valve with a latching unloading according to claim 1, characterized in that: The driving mechanism (3) comprises a driving motor (301), a passive gear (302) and a driving gear (303), wherein the driving motor (301) is fixedly mounted on the left rear portion of the upper end surface of the support plate (105), and the driving gear (303) is fixedly mounted on the rotating shaft of the driving motor (301), and the passive gear (302) is fixedly mounted on the outer upper end of the valve stem (2), and the passive gear (302) is meshed with the driving gear (303), and the diameter of the passive gear (302) is three to four times the diameter of the driving gear (303).

6. A pressure self-sealing stop valve of the underload closing type according to claim 2, characterized in that: The plug-in part (6) comprises a rectangular shell (601), a rectangular slider (602), a plug-in rod (603) and a handle (604), the rectangular shell (601) is fixedly installed on the inside bottom end face of the Z-shaped sliding frame (1012), the rectangular slider (602) is slidably connected inside the rectangular shell (601), the plug-in rod (603) penetrating through the lower part of the rectangular shell (601) is fixedly connected to the bottom end face of the rectangular slider (602), a spring is arranged inside the rectangular shell (601) on the upper side of the rectangular slider (602), and the handle (604) is fixedly connected to the right end face of the rectangular slider (602); when the plug-in part (6) is in the limiting state, the plug-in rod (603) is plugged into the plug-in hole (107).

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